<template>
<!-- 排序区域 -->
<div class='sub-sort'>
  <div class="sort">
  <a :class="{active:sortParams.sortField===null}" @click="changeSort(null)" href="javascript:;">默认排序</a>
  <a :class="{active:sortParams.sortField==='publishTime'}" @click="changeSort('publishTime')" href="javascript:;">最新商品</a>
  <a :class="{active:sortParams.sortField==='orderNum'}" @click="changeSort('orderNum')" href="javascript:;">最高人气</a>
  <a :class="{active:sortParams.sortField==='evaluateNum'}" @click="changeSort('evaluateNum')" href="javascript:;">评论最多</a>
  <a  @click="changeSort('price')" href="javascript:;">价格
  <i class="arrow up" :class="{active:sortParams.sortMethod=='asc'}"></i>
  <i class="arrow down" :class="{active:sortParams.sortMethod=='desc'}"></i>
</a>
  </div>
  <div class="check">
   <XtxCheckbox v-model="sortParams.inventory">仅显示有货商品</XtxCheckbox>
    <XtxCheckbox v-model="sortParams.onlyDiscount">仅显示特惠商品</XtxCheckbox>
    <!-- <input type="checkbox" v-model="sortParams.inventory"/>仅显示有货商品
    <input type="checkbox" v-model="sortParams.onlyDiscount"/>仅显示特惠商品 -->
  </div>
</div>
</template>
<script>
import { reactive, watch } from 'vue'
export default {
  setup (props, { emit }) {
    const sortParams = reactive({
      inventory: false,
      onlyDiscount: false,
      sortField: null,
      sortMethod: 'desc'
      //  sortMethod: 排序规则，asc为正序，desc为倒序，默认为desc
      //  sortField: 排序字段，取值范围：[publishTime,orderNum,price,evaluateNum]
      // publishTime(最新), orderNum(人气), price(价格), evaluateNum(评论)
    })
    function changeSort (sortField) {
      sortParams.sortField = sortField
      // 对价格特殊处理
      if (sortField === 'price') {
        sortParams.sortMethod = (sortParams.sortMethod === 'asc') ? 'desc' : 'asc'
      }
    }
    watch(sortParams, () => {
      // 通知父组件重发请求
      emit('sort-change', sortParams)
    })
    return { sortParams, changeSort }
  }
}
</script>
<style scoped lang='less'>
.sub-sort {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  .sort {
    display: flex;
    a {
      height: 30px;
      line-height: 28px;
      border: 1px solid #e4e4e4;
      padding: 0 20px;
      margin-right: 20px;
      color: #999;
      border-radius: 2px;
      position: relative;
      transition: all .3s;
      &.active {
        background: @xtxColor;
        border-color: @xtxColor;
        color: #fff;
      }
      .arrow {
        position: absolute;
        border: 5px solid transparent;
        right: 8px;
        &.up {
          top: 3px;
          border-bottom-color: #bbb;
            &.active {
            border-bottom-color: @xtxColor;
          }
        }
        &.down {
          top: 15px;
          border-top-color: #bbb;
          &.active {
            border-top-color: @xtxColor;
          }
        }
      }
    }
  }
  .check {
    .xtx-checkbox {
      margin-left: 20px;
      color: #999;
    }
  }
}
</style>
